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CAT IIIb – Category IIIb – Approach

A precision instrument approach and landing with a decision height lower than 15m (50 ft), or no decision height and a runway visual range less than 200m (700 ft) but not less than 50m (150 ft). (ICAO – IS&RP Annex 6). FAA Note – the United States does not use Decision Heights for Category IIIb